-LRB- CNN -RRB- -- As Michael Ballack finally calls time on his 17-year professional career , German football can bask in the knowledge they boast the best two teams in Europe .

But while the Champions League final between eventual winners Bayern Munich and Borussia Dortmund showcased all that is good about German football , the 36-year-old has told CNN the domestic game may suffer as a result .

As well as the continent 's most glittering club prize , Bayern won the German Cup and the Bundesliga by an incredible 25 points .

Dortmund , who won the championship in the previous two seasons , were their nearest challengers , and the pair have accounted for five of the last six titles .

Ballack told CNN World Sport that duopoly could be bad news for the Bundesliga , if Germany 's top league starts to resemble Spain , where Barcelona and Real Madrid reign supreme .

`` In Germany we have a situation now where Dortmund and Bayern are far , far more away from the other teams , and that 's what we do n't want to see in the Bundesliga , '' said Ballack , who has 98 Germany caps to his name .

`` We have a little bit of a similar situation in Spain with Barca and Madrid , and in the -LRB- English -RRB- Premier League it 's more open .

`` These last years we could see a lot of surprises , and from the bottom -LRB- a team -RRB- could beat the first one . It was exciting and the Bundesliga was good to see . Bayern Munich is heading away a little bit so we will see how it develops in the future . ''

Bayern 's historic treble confirmed them as the dominant force in Germany , and with their considerable financial muscle , they are already planning on extending their superiority over the rest .

Shortly before the end of the season it was announced that Mario Gotze -- one of Dortmund 's best players -- would be joining Bayern for $ 49 million , with striker Robert Lewandowski expected to make a similar move in the coming weeks .

While the man who masterminded Bayern 's success in 2013 , Jupp Heynckes , is retiring , his replacement is Pep Guardiola , who won a total of 14 trophies in four years as coach of Barcelona .

So how can the other teams , Dortmund included , keep up with the Bayern juggernaut ?

`` With money , '' Ballack jokes . `` No , it 's difficult for the weaker teams to close the gap because like I said , the bigger teams still invest , and they could invest .

`` If you take Bayern Munich , they just bought six months ago Javi Martinez for $ 52 million , now Gotze for $ 49 million . So that 's a lot of money and it 's not possible I think to do it for any other club in Germany .

`` It is just Bayern Munich who has this good position , and from a financial point really good , and really healthy . And that 's important .

`` Dortmund as well , they are trying to close the gap between them and the other teams , but of course Bayern Munich are far away from the others . ''

Guardiola comes with a reputation as one of the game 's leading coaches , but given the standards Bayern set this season , Ballack thinks the Spaniard will struggle to improve the team .

`` I think sometimes when you come in -LRB- as a new coach -RRB- you think ' I have to change something . ' But if you see this Bayern Munich team now , I ca n't really see where he needs to change .

`` Obviously he has his own idea of football and how he wants to play . I 'm sure he 's seen a lot of games , if not all , in the last six months from Bayern Munich , and he knows there 's not much to improve .

`` It 's an incredible level that they 've played in the last six months or the last year . And like I said before , the little details . Maybe change something just to change something because you want to play your own style .

`` But on the other side , like I said , you ca n't really change a lot because everything works well . But I 'm sure he 's a smart guy and a good coach , and he will handle it . ''

Ballack 's farewell match in Leipzig saw a World XI , coached by new Chelsea manager Jose Mourinho , take on a Germany XI , coached by Rudi Voller .

Former teammates Didier Drogba , now at Galatasaray , Ukrainian Andriy Shevchenko , Bayern captain Philipp Lahm and seven-time Formula One world champion Michael Schumacher , among others , took part .

Mourinho managed Ballack at Chelsea and has now returned to London for a second stint after his three-year tenure at Real Madrid ended in disappointment .

One of the Portuguese 's first engagements will be to renew his rivalry with Guardiola when Chelsea play Bayern in the UEFA Super Cup at the end of August .

And Ballack , who won one Premier League title and two FA Cups in his four years at Chelsea , and three Bundesliga crowns with Bayern , says his time with Mourinho was a golden spell in his career .

`` He has a fantastic reputation at -LRB- Chelsea -RRB- , also I think in England . He 's a charismatic manager and I really enjoyed working with him for two years and most of the players as well I can say .

`` I think -LRB- his image -RRB- is not always what you see in the media . What we have as players , is another picture . And that 's the picture in the dressing room .

`` It 's the daily work with him on the pitch and his speeches when he talks to us . And that 's what I can say is special , because his attitude , his personality , if he comes in front of the group if he talks to us .

`` What 's fantastic is he brought the team behind him . And that shows not just in Chelsea , he also adapted really well on the international -LRB- stage -RRB- . He worked in Italy , he worked in Spain , and everywhere he had success . ''

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Michael Ballack tells CNN the dominance of Dortmund and Bayern is bad for Germany

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Two sides contested Champions League final and are streets ahead in Bundesliga

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The 36-year-old says new Bayern coach Pep Guardiola has a tough job to improve the team

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Ballack played a farewell match in Leipzig as his 17-year career officially came to an end